This volume brings together a rich variety of papers, which were given at an international conference entitled Between Worlds: The Age of the Jagiellonians in Cluj-Napoca in October 2010. They cover various aspects of the impact of this important dynasty on Central, Eastern and Southeastern Europe, and its reign in Lithuania, Poland, Hungary and Bohemia between the 14th and the 16th century. Thus, the relevance of the Age of the Jagiellonians for the transformation of Europe between the late Middle Ages and the Early Modern period becomes visible. Various approaches to the overall topic can be found in this volume, be it from the viewpoint of war and religion, frontier studies, politics, theology, historiography or art history.